The respiratory system in health and disease.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000397:Air Pollution; D001991:Bronchitis; D002648:Child; D002675:Child, Preschool; D003139:Common Cold; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007251:Influenza, Human; D008875:Middle Aged; D010612:Pharyngitis; D012143:Respiratory Physiological Phenomena; D012140:Respiratory Tract Diseases; D014069:Tonsillitis